Honestly, I would stock up on CF cards and get a backup drive that reads straight from the card. (Colorspace makes a nice one).
I would leave the laptop at home unless you absolutely need to edit images while on the trip (You mentioned you might not have much electricity) Go light and get souvenirs and meet people.
When you get home you can take a week and just go through images. Spend your time on the road making images and enjoying your trip. Save the editing for when you get back home.
I have to have a laptop too, which is why I carry the smallest one out there (11-in MacBook Air), because I write travel stories and design/post web pages from the road. This means doing basic sorting and image editing both for my website and for a newspaper I freelance for. I also upload my GPS tracks to LR4 on the laptop, so that I can encode each image with location data. I've been doing this for years and have developed an efficient workflow, so it doesn't draw much time away from the more important travel experience. In fact, spending so many months alone on the road, often not speaking the local language and confined to my tent at night (rain, bugs, middle of nowhere, etc.), I find looking through the day's catch enhances the experience and helps me learn what to do/not do the next day, with regards to photographic technique.
Oh, and there's not one cubic centimeter of space available for souvenirs--so my photos serve that purpose.